If the rm uses the same clutch basket then it can be made to work.  I just bought a crf450r z-start pro and had to get a different spacer that goes above the clutch lifter and a different gasket for my clutch cover because the rekluse sticks out slightly more then stock.   This was a great upgrade for me in the slow single track I ride. 

I am sure rekluse doesnt make parts for the lt but if you could figure out the size of the spacer I am sure they would have them it is basically just a different sized washer.  Also if space was a issue you could make your own thicker clutch cover gasket.